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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7043c2542899c7147e9a78edc26887e0b5232055d1b45659d80cc89c26321bd' 
  AND token = 'CfJ7Q5FAynXMML1h9FZlJNshHq1qhNlv83PFzOPoRJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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