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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63c3010004ec417fc3b20414240baa86bd19f32d3f740ed65729d24c1b5bc156' 
  AND token = '+NspiOdMiVrxsEE95l5TjIfSlkUlTIMyHO2MhttRPm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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