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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b66fca88c105fba306970eeef332bd4dee97672c1cccae3dd8b4b103831e50b' 
  AND token = 'k2qnjJgOT7JXu6B8J16WPiH7VVTFL0fjwrTvSlQJ2tA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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