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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b1aad13f118bf8694c524b267c5324cdcc44aa7cb01d7b22f131b9fd4d9aab6' 
  AND token = '93EPXyCfJOnE6p+1XtPJUiN2lAh7gzqdyV7DnUnw/ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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