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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeb1b8de6f8aa7821f2bf9b9018dd89575132b7e6fab7deda8e027fff57b0898' 
  AND token = 'UXDaUkQ/1iHJO6OMseX7uSDp/W6wjJu0onJU92uIe0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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