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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac4f1f45b5a18188f48e6592697dfd6e623be8c57826d618e290cdaf01d5a8bf' 
  AND token = 'EEDVBRe4iRgjk50xCOqsHhtOqvbSHJg929Vc2HGmLVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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