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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cdf7df303fb8e5bf2e42dba6f9fa5c6624e45264c9c3e350041b49b14e72946' 
  AND token = 'XbY1FUxgtT4jt8j8K8DY+0xy3Cs7AcYQHarFjVjycmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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