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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7897759406e83a9a140acbd96e3e714f0abe73d132a79b1db40aca276412a20c' 
  AND token = '1uaKsPKgveiypOrhUZuA0Lrl/zA3uqn0Z+YTQPUEgdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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