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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1c3d0308a65871a06a8c0a85af900ad79af028f688931c3393f62182ce23bbc' 
  AND token = 'Uy3hevHX4Hl0X+GuM8DwqC8p9chXWW4rE42p7fKipuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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