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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73eabff3d39b255678de543984f55e1b19088fcc7e6850000f7998b8d1249e7b' 
  AND token = 'wg4hkUuB70Hoz6Ai8RrsDYaEpQgk7lWmilhLnWg7vSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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