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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55b6e2185baec82be45b1584e78211b4eb535d598dfaccdcf2a2b97d4d016984' 
  AND token = 'fjw4koxGzbBFRXiH8v11PbhsE21I4knj7inGw1SS200=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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