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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebe351aba5c5d78adf02e584337c8a93b29c62f461e05833ec8a8b82beb823b1' 
  AND token = 'Y4f0Rm2ns16BPAWgcE7xr4dLKIvvj+wbMaiEcm4+mLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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