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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4623d6880daa3a1e414d53e417562cb04f2b4334465b857057d70a5e0541433' 
  AND token = 'eZfXBocEoWtrYnUgpDq65raXNKwc+rXr6/oRjyo7irw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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