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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a8c8d0957052e427ebae3e00c92ef86adc90af24e687d06de8708a0f522fbb1' 
  AND token = 'eGEAmf2sIv7FciGr7+ws8wFVdp0NRgbp7Y12MotEMN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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