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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e903368c658acf756f00baaf461aec4056a370ae19b7326d95316030a356ee62' 
  AND token = 'qlZT5kDR/y78GqMecBmSNT3d5CUmR75+vwvSn8/alyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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