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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a7665221ea09957e71b50efd4def1a4c5bff4ae3610a1bc6b89f60fc163b4da' 
  AND token = 'I/uj08uZbnY8/lHI5x4gLTLvb7fUQ9XevyUjpsjJVYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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