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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '987f22d0a55576bd0de31997c0c3344ff3d0a8451e31927fc185e62d23359502' 
  AND token = '0baT6TRvw2y8qKhMXWVsjI/OCuIqd0FVi2ueLipAcZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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