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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '517d8dba7c3497241bcbd80569cd5ef0e0d5b17b07bce5cd05a9b5ed79c947c6' 
  AND token = '2Bwt3SLFq/e67YJyYqVkE0Nikgap17hwT9v+RhfRMMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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