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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1eea74ad4294a524d9cfb0ee4134d19049515618c05fe68aa12e43f6696d9f6' 
  AND token = 'F/Gz+FEQw9NpmpaJ96zhy0NqKA9sT/9hfZaZYMiVwLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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