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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4ac71d5945031d76eb68624d1046fe775b8380cfaea6dc0b278867cae491abe' 
  AND token = 'aVYBfnW9BBLwUzWZo86pkujX/IVNjln3Q2VPQ0ZaQI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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