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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0ce0b8542b218494b127a3cb915e280c65b6cdd5f47d912f70740bbfaf98a39' 
  AND token = '/kBOC/A6zIvwtjijT4ps3oH9PrBxgbk4AoFsrMlEwo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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