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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '145f4f55e0266d269c5b4530e009fa2907bfb9794455aca32192cac1dc25ab8f' 
  AND token = 'tIyYGPpsbv0toTG7W05mPrAUcGWk8PLb9INh0PXIEqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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