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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3701c2a27eb46d2bd0abab1773d895fcfcde6a6b24b364c13a6cad6ed285c8e2' 
  AND token = '8NmU4Wjd2KvezCDweHIuJpepNA7ib+61lCdaVNrNz8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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