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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a435ec5913eab62dac883b0daea6dc87342e98dd0d8b5e93dc3eaf9fd87cd8cd' 
  AND token = 'QClM4uTh9s9JzT1kfYk+z+b0faBVPQhwx2Psp4KZ7vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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