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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '822e98e20e67948adf2ae3cbae908b7a214e3a41e3d5efa10d11dcce567874db' 
  AND token = 'fG3dlwiMEPmeg1skv4oV+4gs+IjMUDp6seSqxeHTVAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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