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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f787634dfca77cf11fdb35828ef6cbdedc122ef78e9531604b15e5a83581e2ac' 
  AND token = '3W1qCiGAq0izyoj97kR7RVfIN5CX6eVui/Dpa8pLO/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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