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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b9b89ea3affca9e8e9d3c573a97f4d8c6b60428bf0f2e4365d0adeddc10793d' 
  AND token = 'ZnW25Ew7DVqE4RlSkixo8UBXytkTd6MQwhAre7bLnQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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