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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1128297c0fb8978a0303080cfdd7f13ba26dd0f0469d22b4d811ad66bc08400' 
  AND token = '8EdC2M4YhWehFzKOivGCydZpNe/laagND7MctPtN/Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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