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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb6ca082a292092faea35f815134b45b4c5fa16ff897917640367ab8bbaac2e0' 
  AND token = 'BNXCeCBVM8YojQKe/p05fhxCUP6/+NwbU9NR9jYH54o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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