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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b6a447f6ff44c48d3d366437b85c518286c01dc7f240496033d4d0f4411003f' 
  AND token = 'IJwj+ZDlAK0jHXabFX9pzp8JIN7cIRqulUayE8xI2xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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