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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0914a33b1317209e1c8690216c84f927da7097f677d36ad450822585f4aadbcb' 
  AND token = 'wXb7jYPaf1qPssKsMw/4r756MuULwqPajdnND52I8y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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