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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df5ac57a269b04efc47c92498f336dba97b254db0d945eb22b69d18b6c57a530' 
  AND token = '18mZWwbeOB2lGfytxFn2jOPzPfaUGWns0yrpenAgpTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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