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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b8707a1ed8d7588e16b27d26299192e74a76e7659e617fe280a56822423c990' 
  AND token = 'cqwjO1mH1jgCOIRTaX2HPAgjI1zlZBKOjh0Da95BnH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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