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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '286747a6b02ec6eea521f303481f09717f2e6e18905b899a2db357fb21a256f6' 
  AND token = '5KNUCyrhPsaCYT7G7I8IOm/emgbeChwidVQJ75MK4SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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