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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d68af4b8e328b6998078552421b69bcc5037b952747bbf5d7402568849b600c' 
  AND token = 'srKco70Wuj9bJuUKTf1POU0YbrtHYKJsz0Yob71Ht1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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