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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fcfed3d5ab12a2cabe3b5c8e08e73cc114995c018db08c96e03e2da8b3be34f' 
  AND token = 'nC3LxbD1Uez8fz+VSYt0RUG7PREIIXRMf50Z5KF/k48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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