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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed2241a4a1c9998b5a6a18248210b9614262e522ff7826f65b5a1bda20b62524' 
  AND token = '1pTciKm3yikZzyfGfM7oN6h7lbC2J0JQhXUcDhDyp+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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