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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0c5a8fa3fad08b1304b474d2464752d1e01fda02a2e81cafd4cb3d48bf370b4' 
  AND token = 'qO2NbjBUGS33mUthA/3zWftgXQxC5Qv0FiEP13BOH7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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