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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '735b6e11fbf1cb0adf130145d13dbd2a2e0debed6f8a51a1ed0ebf0ba4f642a7' 
  AND token = 'l+xsxY5RGVzlpd5gOb6PJ5Bqx9dG7eGT3upIf7SZ9tY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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