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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab0e76a12284717aa3f9296ace1d9aaf3467bce972be22cce408c4c403c170de' 
  AND token = 'JinBLq+mwmQwVRodtInBXG+HOSJj6Xf8ArE7UThCwOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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