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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8f199e7c7a6ffefb1abac9b60c687dac996093bf2474a38d73b5b300a44296e' 
  AND token = 'mgkTnjRSXvAWogx4559fNu8d0AcYGY/YlaG6pb7HHQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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