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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc8abc0a53b1d46392e06df9fb2a15803f4b167775cc3ff31758ba6529f1e2f2' 
  AND token = 'OXzb7ejAWTEwrXdS6qQW90JxERDF5dcsX5wOrLBCP8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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