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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ad7b9af9795ca3b9f97fc6801b810429c5cece6f47b1cfbf4ba3e6aec15955b' 
  AND token = 'go95JVGWZfkaw4I2cBnamtHi9LBgmpmOfS9wWYLwePg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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