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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1d957fc897593de3caa7deb5256704ad6b9d5798f530b3ca8b8aa762dcb5337' 
  AND token = 'D+7/oflayr7Yle0pboMGGY4DbfJ4f97HvjNKJdLr55A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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