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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6f8354ee153f6c0684daaceb701b55d77d687673f9e9565c6781f26fc0d526c' 
  AND token = 'ecQBv9rCas/qhabj5f6R19gszI2p1dnbyttCl8ECPYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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