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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1e23e2c8a548028363df442d71ae24baeb85ef44558af32daede4154c7f7d6c' 
  AND token = '3xhGOWdVAlEwLwaiW2aAiWXCzZ7aW1Np6INh62EjoyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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