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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3acaf64f38d578e1334ca19d70143c742ab4d90448a6a7951edfd919c3f9f7e' 
  AND token = '/XywSsZdaAJ3V7FOQMe9pkExbjkeKPlgw5JHxTcftE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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