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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0d13b66602a28fce49deefebcf7a7c75d26fb3e22626eaa59ea75ae2623bac6' 
  AND token = 'ubyh0S2kcgAuFs5rOLPx9iiY9elqMwmcy4o6k/DQjHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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