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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c963121eeb4769f59e2869b19f022956b0a9a937865be5618d88de14e6fdef5' 
  AND token = 'rp/xCYr+8/qxkQKupBApngU9DWA76i8Uf0CG0CW83os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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