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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b45563beedbc3a8e28165c8176409b5ea8715cbf60695908642b8ae60ba6f6f9' 
  AND token = 'Sh4ZXEkjYi6nQC2JcBTiYFZXZaxaok5+Yis9oFDXWdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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