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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa2a9fe5b6cee9a1d909c046f24013d29872a17cf84b7964fe4414498accc6c5' 
  AND token = '31dbbaFs6DoRUDdpdLXz4YKutRLC/0wT32wUl29Ilns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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