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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c317c0d690288abb049ed3f3ae4abc10411d673bea577762ed27de03fa5ee3d' 
  AND token = 'I++ujBTjqyMo1zSwmDIt5U3AvGqFEU4Ta11RuSmJ6oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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