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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1486f6aa698bbcc4901f4ce1bb84b061a02df549521956d7e6320519063ae865' 
  AND token = 'bNtXuYhV2rUS456ydtTMBcFPD+gpXhJnykA2kIeNZBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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