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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb468afcf419e14a5582f49d79ec90ee9ba1b341f53c3fa33ccc4829aa594b3a' 
  AND token = '4BGKHI10ak2dYtyhSMWllX0NwLCtc0rabVfEbiMoiOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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