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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5ae7df74940d1454ac70b0c3c55b2b155372b8e02dece6148ee27a2030fc3ec' 
  AND token = '9fcKNBsgFX4l4EE5ro3QfZY78jJVnDdZC1oYITFPWM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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