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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b407369c74b079cec0fa5221e3ae0f6f20f178fc9c2161d371e99918fc2d9372' 
  AND token = '3gnE0C6N8HNsFvJ1tplj5PFot4CQoPEVq7igFgoN41I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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