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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3d695009d3b42f1bd5c4b1e7feb5f67020e1c661c37c720c2ea30bf592a2d68' 
  AND token = '3L0a/gMvRcxkDKwZK0XOwENiLsb1BcqkOPDsTDPDRGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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