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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0456890ca076e83266ce5decf875fe77b936cd8908c11a55e2a40a3924a18b8' 
  AND token = 'dzwAz2o0dV5Qv+/gFlx9++OkkM7703i6x10PRhNzV9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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