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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af5d9e0769ce08c3b1e5458dbdd4444a2a57e24be42a6f27441b79661eb67ffa' 
  AND token = '59qk9WAs/9fcqJWxgfAg6WZnpBJR5sB7ysHLfZLsA34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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