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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3491fc1c8bf7b6b5b5721eb35dbd803729e5194650136ce69bcdc203f9bcb50' 
  AND token = 'IElJBgqKmbNrC3e7sItC97rt5K5SH+b1eTmoKOj1dEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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