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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2d58e8cc9620d0141bf65e5d66f650546f20f5bfd40ce68a51fd6610d959fdf' 
  AND token = 'B7sFsZ8YhW6RbdTnjiO8/Qqx+Xev2W0QKaic4BDtm2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}