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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71c7e601a37f2674319a908fbeb724129b9cf5519c4b56e98439f5db3706e2b3' 
  AND token = 'fO5sQAKcMxbQPU9b8ABLzms22drujbkZjT7yvXbOz1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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