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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2a224f60d71880b0fb9264876be5cd47ff335eb67b948dc9e2667a9e80a322d' 
  AND token = 'VNvZoaZDl+k4d8Es8upZKlhn4lvQ2++/MkbV+DdKnpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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